Hoisting device.



H. A. MYERS. HOISTING DEVICE.

APPLICATION FILED OUT. 23, 1911.

1,040,386. Patented 0013.8, 1912.

HUBERT A. MYERS, OF GOSI-IEN, INDIANA.

HOISTING DEVICE.

Specification of Letters Patent.

Patented Oct 8, 1912.

Application filed October 23, 1911. Serial No. 656,240.

T 0 all whom it may concern Be it known that I, Hunnnr A. MYERS, acitizen of the United States of America, and resident of Goshen, Elkhartcounty, Indiana, have invented a certain new and useful Improvement inHoisting Devices, of which the following is a specification.

. My invention relates to hoisting devices of the kind ordinarily knownas hay cars.

A device of this kind, as is well known, comprises a sheave for thehoisting rope, and an automatic mechanism for cooperating with the saidsheave to grip the rope and prevent the load from falling when it isdesired to keep the same suspended in an elevated position. Thus, forexample, the hoisting rope can be operated to elevate load and then whenthe pull on the rope is relaxed the said mechanism cooperates with thesheave to grip the rope and hold the load in an elevated position. Afterthe load is removed, the said mechanism is then controlled, in variousways, to free the rope and allow the same to descend for another load.It is old, for example, to control the said mechanism merely by theforward and backward motion of a hoisting rope itself, whereby anauxiliary rope for controlling the said mechanism is not necessary.

My invention relates more especially to a hoisting device of thisparticular character.

The object of my invention is, therefore, to provide a hoisting deviceof this kind in which the so-called clutch mechanism that cooperateswith the sheave to grip and hold the hoisting rope is of a simplifiedand highly efficient character, and in which improved and reliable meansare provided for enabling the operator or user to employ the hoistingrope for controlling the said mechanism, as will hereinafter more fullyappear.

To these and other useful ends, my invention consists in mattershereinafter set forth and claimed.

In the accompanying drawings-Figure 1 is a side elevation of a hoistingdevice embodying the principles of my invention, showing one side orhalf of the casing or housing removed to bring into view the sheave andclutch mechanism inclosed thereby, and showing the yoke of said clutchmechanism in vertical section. Fig. 2 is a vertical section on line 2-2in Fig. 1, the sheave and clutch mechanism, however, being shown inelevation. Fig. 3 is an enlarged fragmentary perspective of a portion ofthe said clutch mechanism.

As thus illustrated, my invention comprises a casing or housing A of anysuitable, known or approved character. It is preferably made in twoparts, and so formed as to provide slots or openings (4 for themanipulation of the hoisting rope. The said casing or housing is heldtogether by a bolt B which serves as an axle or journal for the sheaveC, the ends of said bolt being provided with suitable nuts 5 by whichthe two parts of the housing are clamped together. The said sheave is ofordinary character, except that it is provided with laterally projectinglugs c that are formed with rounded portions 0' at one end thereof, andwith beveled portions 0 at the other end thereof. The yoke D straddlesthe said sheave, and has the lower ends of its two arms pivoted at (Z tothe sides of the casing or housing. The said yoke is curved outwardlyand upwardly from said pivotal point cl, so that its upper portion cZmay overhang the sheave, a shoe or clutch block (Z being pivoted in theupper portion of the yoke immediately below the said top portion clthereof. Movement of the yoke D to the left will, of course, bring theshoe (Z downwardly upon the hoisting rope on the sheave. Movement of thesaid yoke in the opposite direction is limited by a pin or stop (Z onthe inside of the casing or housing. The yoke is provided at oppositesides thereof with inwardly projecting vertically disposed flanges (1which are adapted to cooperate with the lugs c in causing the shoe (1 tobear hard upon the hoisting rope when it is desired to hold the latterstationary. When the sheave C is rotated to the right or in a clock-wisedirection, the lugs 0 will engage and pass under the lower ends of theflanges (1*, thus producing no mechanical effect; but when the rotationof the sheave is reversed, and when it is moving in the direction shownby the arrows, then the beveled portions 0 of said lugs will strike andslide upon the flanges d", thus producing a wedging action that mustnecessarily result in forcing the shoe (Z very forcibly and powerfullyagainst the hoisting rope on the sheave. l/Vhen this is done, the partsare automatically wedged or locked in such condition that the hoistingrope is held stationary.

It is, of course, necessary that at times the hoisting rope be allowedto travel clownwardly to the ground, either to obtain a load or deliverone, and at such time the sheave must rotate in the direction indicatedby the arrows in Fig. 1. At such time the yoke D and shoe (Z must belocked in an inoperative position, as shown in Fig. l, and for thispurpose certain locking mechanism is employed as follows: The lower endof the yoke D is formed at one side with a bifurcated finger (Z and inthe slot (Z thereof a plate d is pivoted to swing freely back and forth.A dog or locking pawl E is pivoted upon the inside of the casing orhousing and is provided with a portion 0 adapted to engage the finger (Zto hold the parts in the condition shown in Fig. 1. This dog or pawl Eis fulcrumed between its ends, and its longer or rear end is providedwith a pivoted element 6, the motion of which in one direction islimited by a pin or stop 6 on the said dog or pawl. For operating theelement 6, to cause it to swing upwardly and engage the pin or stop 6the sheave is provided with pins or projections 0 and the element 0 ispreferably bent inward to project into the path of these pins orprojections on the sheave. Now the parts as shown in Fig. 1, the sheaveC can revolve freely in the direction indicated by the arrows, thuspermitting the weight carrying portion of the rope to descend to theground. This is by reason of the fact that the dog or pawl E is at thistime in looking engagement with the finger (Z whereby the shoe or clutchblock (Z is prevented from moving down upon the rope on the top of thesheave. hen the motion of the sheave is reversed, for the purpose ofhoisting the load, or for the purpose of hoisting the carrying portionof the rope to obtain a load from overhead,

one of the pins 6 will then strike the element (2 and cause the latterto swing around until it engages the pin or stop 6 thus making itimpossible for the sheave to rotate farther in this direction withoutdisengaging the dog or pawl E from the finger 6Z5 on the lower end ofthe yoke. As soon as this is done, which results also in a consider--able downward movement of the portion 6, the yoke D and the shoe (Z willtend to fall forward, or to the left, but the lugs 0 will bump on thelower ends of the flanges (l and thereby keep the said yoke insubstantially the position shown in Fig. l, as this is necessary inorder to permit the said lugs a to pass below the lower ends of the saidflanges. During this time the plate or element (Z is hanging downwardand blocking the engagement of the hook portion 6 with the finger cZ-that is to say, the hook portion 6 is at this time in engagement withthe lower curved edge of the plate or element (Z whereby no lockingaction at this time can take place. When the load has been elevated tothe desired extent, or when the load carrying portion of the hoistingrope has been brought to the position necessary for obtaining a loadfrom above, the operator or user then relaxes the pull on the hoistingrope. This, of course, and owing to the fact that the portions 6 and 6Z5are not at this time in looking engagement, causes the beveled portion 0and the lugs c to ride upon the flanges (Z until the shoe or clutchblock 6Z2 is brought down upon the hoisting rope on topof the sheave.This wedging action, as previously explained, blocks or prevents thefurther motion of the sheave in the direction indicated by the arrows,and holds the rope stationary. At this time the portion CF is out of theway of the portion (2, so that the said portion 0 does not engage theedge of the plate or element d, and consequently the other end of thedog or pawl E, which is heavier than the portion 6, drops down andthereby carries the portion 6 into a slightly elevated posit-ion. Now,when it is desired to again lower the hoisting rope for another load, orto deliver the load received from above, it is necessary to first pullon said rope to thereby rotate the sheave to the right, or in aclockwise direction, to an extent sufiicient to push the yoke into avertical position and thereby bring the portions (Z and 6 into lockingengagement, this being pos sible by reason of the fact that in thisoperation the portion 6 will engage and slide under the portion (Z andwill thus engage the element 61 and push it backward and out of the way,as shown in Fig. 3. The parts are thus again locked in the posit-ionshown in Fig. l, and the rope may now descend for another load, or todeliver the load from above, depending upon the character of the work.At such time the pins 6 strike the element 6, but as the latter is freeto swing backward or to the right, and is curved on the edge where thepins strike, no mechanical effect is produced, and the rotation of thesheave is not retarded or in any way interfered with. Then as soon asthe rotation of the sheave is reversed, and the above describedoperation repeated, the portions d and e are again disengaged and theoperation is then exactly as before.

From the foregoing it willbe seen that I provide a hoisting device inwhich the automatic clutch mechanism is controlled entirely by the backand forth motion of the hoisting rope, and through the medium of asimplified and reliable construction. In this way an auxiliary rope isnot necessary, and the entire operation is controlled by the same ropewhich carries the load.

Preferably, a spring F connects the ele ment E with the casing A, asshown in Fig. 1, whereby said element normally engages the stop pin. fon the casing, but is operated against the tension of said spring by thefinger d which latter is beveled to slip into and out of the hook e, inthe manner explained.

It will also be seen that the plate (I is preferably provided with a pind that strikes against the lower or outer edge of the finger d, to limitthe swing of the plate (1 into the slot at, whereby the previouslydescribed operation is insured.

What I claim as my invention is:

1. In a hoisting device, a sheave for the hoisting rope, a yoke thatstraddles the sheave, a shoe or clutch block on said yoke, adapted toengage the hoisting rope to hold the same and the sheave stationary,flanges on the yoke, lugs on the sheave for engaging said flanges,locking mechanism for holding the yoke in position to prevent said shoeor clutch block from engaging the said rope, and means on said sheavefor controlling the said mechanism by the back and forth motion of saidhoisting rope.

2. In a hoisting device, a sheave for the hoisting rope, a yoke thatstraddles the sheave, a shoe or clutch block on said yoke, adapted toengage the hoisting rope to hold the same and the sheave stationary,flanges on the yoke, lugs on the sheave for engaging said flanges,locking mechanism for holding the yoke in position to prevent said shoeor clutch block from engaging the said rope, means on said sheave forcontrolling the said mechanism by the back and forth motion of saidhoisting rope, said mechanism comprising a pivoted dog, means on saidyoke for engaging said dog to hold the said shoe or clutch block awayfrom the hoisting rope, a pivoted element on said dog, which element isadapted to be engaged by said means on the sheave to disengage the dogfrom the yoke, and means on said yoke for preventing the dog fromengaging the yoke while the sheave is rotating in one direction.

3. In a hoisting device, a sheave for the hoisting rope, a yoke thatstraddles the sheave, a shoe or clutch block on said yoke, adapted toengage the hoisting rope to hold the same and the sheave stationary,flanges on the yoke, lugs on the sheave for engaging said flanges,locking mechanism for holding the yoke in position to prevent said shoeor clutch block from engaging the said rope, means on said sheave forcontrolling the said mechanism by the back and forth motion of saidhoisting rope, said lugs being so formed that they pass under the lowerends of said flanges when the sheave rotates in one direction, and saidlugs being formed with beveled end portions which enable them to engageand ride upon the said flanges when the sheave rotates in the oppositedirection.

Signed by me at Chicago, Illinois, this 11th day of October 1911.

I-IUBERT A. MYERS.

Witnesses:

S. LEWIS, Gno. F. SCHMIDT.

Copies of this patent'may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

